Which of the Following Relationships Are Sufficient to Ensure That $\Delta$

Multiple Choice

Which of the following relationships are sufficient to ensure that reactants and products will be in their standard state at equilibrium?
I. $\Delta$ G = 0
II. $\Delta$ G° = 0
III. K = 1

A) I only
B) II only
C) III only
D) II and III only
E) Reactants and products can never be in equilibrium in their standard states.